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How to determine whether an object has a given property in JavaScript
How can I determine whether an object x has a defined property y , regardless of the value of x.y ?
7 Answers
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Code Golf: Lasers
...t; 160 chars.
Solution had 166 strokes when this contest ended, but A. Rex has found a couple ways to shave off 6 more characters:
s!.!$t{$s++}=$&!ge,$s=$r+=99for<>;%d='>.^1<2v3'=~/./g;($r)=grep$d|=$d{$t{$_}},%t;
{$_=$t{$r+=(1,-99,-1,99)[$d^=3*/\\/+m</>]};/[\/\\ ]/&&...
How does this giant regex work?
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This is not entirely a regular expression. The regex is /.*/, which basically means "match everything". The /e Modifier however eval()'s the code in the next parameter. In fact this is a way for someone to hide code. The following proof that this is ...
How can I remove the decimal part from JavaScript number?
...n the meantime.
Another method of truncating the fractional portion with excellent platform support is by using a bitwise operator (.e.g |0). The side-effect of using a bitwise operator on a number is it will treat its operand as a signed 32bit integer, therefore removing the fractional component. ...
Is there a better alternative than this to 'switch on type'?
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python capitalize first letter only
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@Jan-PhilipGehrcke that is an exercise for the reader. You can see in that case, s is never empty, it is always '123sa' :D
– Ali Afshar
Sep 13 '12 at 16:02
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Scala @ operator
...e following, for instance:
val o: Option[Int] = Some(2)
You can easily extract the content:
o match {
case Some(x) => println(x)
case None =>
}
But what if you wanted not the content of Some, but the option itself? That would be accomplished with this:
o match {
case x @ Some(_) =...
How to calculate the angle between a line and the horizontal axis?
...to determine how to calculate the angle between a line and the horizontal axis?
9 Answers
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What is context in _.each(list, iterator, [context])?
I am new to underscore.js. What is the purpose of [context] in _.each() ? How should it be used?
5 Answers
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How to copy text from Emacs to another application on Linux
When I cut (kill) text in Emacs 22.1.1 (in its own window on X, in KDE, on Kubuntu), I can't paste (yank) it in any other application.
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